Improvement in machines for cutting locks in hoops



L. S. HOYT.

MACHINE FOR CUTTING LOCKS IN HOOPS.

Patented March 7,1876

la L 1 WZIZeJiSFS.

NJ'EIERS. PHOTO-LITHOGRAPPER. WASHINGTON. Clv C UNITED STATES PATENT LEWIS S. HOYT, OF WEST LIBERTY, IOWA.

IMPROVEMENT IN MACHINES FOR CUTTING LOCK'S INHOO PS.

Specification forming part of Letters Patent No. 174.531 dated March 7, 1876; application'filed 4 January 11, 1876.

To all whom it may concern:

Be it known that I, LEWIs S. Hovr, of West Liberty, in the county of Muscatine and My invention consists generally in a novel combination of devices, whereby the two outs necessary to form hoop-locks in hoops of differ, ent breadths are simultaneously made by a single oscillation of a slotted lever, which actuates the other working parts, and also in a novel means of preventing the two knives which cooperate to cut the notch which forms the hoop-lock from suffering damage by com in g together at the end of their respective cuts.

The construction and operation of my invention will be fully hereinafter described, and specifically pointed out in the claims, a preliminary description being, therefore,'deemed unnecessary.

Figure 1 in the accompanying drawing represents a front view of my hoop-lock-cutting machine; and Fig. 2 represents a vertical section of the same on the line a .70.

Similar letters of reference refer to like parts in both figures. v

S, Figs. 1 and 2, represents the standard which carries the movable parts and guides the said movable parts, as hereinafter described. The standard S is preferably made of cast-iron, and it has cast on itsbottom a flange or base, B, Fig. 2, by which it may be firmly placed upon and held to a workbench or other suitable support by any ordinary mea ns employed in attaching machines to such supports. In this standard S is formed a rectangular space, S its vertical sides being preferably parallel, or nearly so, with the principal vertical axis of the said standard. The inner vertical sides of the standard S are made of V-shaped horizontal section, the edges thus formed being directed toward each other, and being placed parallel to each other so as to act as guideways w for the direction of the motion of the reciprocating knife-slide S The reciprocating knife-slide S has its right and left vertical sides parallel to each other, and

thesesides are formed with grooves therein of V-shaped horizontal cross-section to fit-upon *the ways w. To the upper part of the standard "S is pivoted the lever L, preferably bent as shown in Fig.1, and having formed in it the curved slots, in which curved slot, plays a friction-roller, r, pivoted to the knife-slide'S The curved slot 8 is so formed that the ascent or descent of-the knife-slide S caused by the oscillation of the lever B acting upon the friction-roller r and the pivot p. by the upper-and lower walls of said slot .9, is most rapid toward the last portion of theascent of said knifeslide, and also of the first portion of. its descent, but slower and with greater staticpressuretoward the latter part of the descent of .the said knife-slide, atwhich time the knife 70 carried by the said knife-slide, and hereinafter described, performs its part of the cutting. The knife-slide S has formed upon its front side a projecting knife-stock, K, carrying the knife k, attached to the knife-stock by screws,

bolts, or any other suitable means. The

knifestock K is preferably made with its lateral face perpendicular to the front face of the knife-slide S and on its right sideis formed a depression, (I, into which the knife is fits parallel to the side of the knife-slide, in which the said depression d is formed, the upper edge of the knife k abutting against the shoulder 8 which is left in making the said depression, so as to relieve the attachments of the said knife from strain. 0n the under side of the-curved lever L is formed a projecting knife-stock, K. This knife-stock K is made with its lower part expanded into a flange to form a plane to which the knife is is attached by screws, bolts, or in any other suitable way. On the under side is formed a depression, d leaving a shoulder, 8 against which the back edge of the knife k abuts to relieve its attachments from strain. In that side of the knife-stock K which faces the knife-stock K is placed an adjustable stop, sf, formed of a screw, which may be so adjusted that its outer end abuts against the inner side of the knife-stock K just before the knife 75' would otherwise meet the knife k, thus allowing the knives to approach sufficiently near to cut out the piece. necessary to be removed .is being cut. or successive parallel ledges 1, preferably ar- -passage of the kniveskand k. ring the act of cutting the lock, is rested upon from the hoop to form the lock, but preventing the said knives from receiving injury by actual contact with each other. The knifestock K is made adjustable up andv down in a slot, 8 in the knife-slide by means of a clamping-screw or, other equivalent device, by which means the knife 70 may be adjusted to complete its vertical cut at the same time the knife 70 completes its curvilinear cut. The fulcrum of the lever L is a stud-pin, p, which is firmly fastened to the standard S by a lever-nut, l, the stud-pin being placed in a vertical slot to render it vertically adjustable. T is. the table which supports the .hoop h (shown in dotted outline) while the hoop-lock This table is formed with steps ranged so that each step or ledge shall be slightly higher than the next exterior step or ledge. Upon the back part of the table is formed an upright flange, F, which is bolted or otherwise fastened to the standard S, and which has a notch formed in it to permit the The hoop It, du-

the'table T, the interior side of the said hoop being faced outward, as shown in the dotted outline in Fig. 2, the upper edge eof the hoop resting againstjthe flange F, and the lower edge. against one of the steps or ledgesl.

'To theend E of the lever'L is, preferably, attached a connecting'rod, R, which connects thelev er with a foot-treadle, it being preferred to operate the machine by foot-power,

'butthe lever may be operated by hand or. 'other power.

The operation of the machine is, then, as.

follows The'hoop h, shown in dotted outline,

being placed upon the table, as hereinbefore described, and as shown in' dotted outline in FigsL-l and 2, the end 15 of the lever L is depressed until the inner side of the knife-stock K abuts against the end 0 of the adjustable stop 8 During this movement the knives k and 7t make their respective'cuts, terminating their cuts simultaneously.

The difi'e'ren't steps or ledges l on the table T serve to accommodate many different breadths of hoops without any special adjustment of the parts of the machine to enable it to receive the hoops after the first adjustment. The steps or ledges I, while they admit diiTerent hreadths of hoops, hold each particular width of hoop, when its lower edge e isplaced against the proper step or ledge adapted to that width, at the proper angle to give the requisite inclination to the sides of the notch cut in the hoop, which notch forms the hooplook.

I am aware of the patent to W. and H. A. TRIPP, dated October 1, 1872, and numbered 131,835, and I hereby disclaim the construction of hoop-lock cutter therein shown and described.

I claim- The standards S, formed with the rectangular space S and the knifefslide S arranged to move vertically in said rectangular space of the standards, carrying the adjustable knife-stock K, knife k, adjustable stop 8, and pivot 19, in combination with the table T, having a series of steps, 1, and the lever L, pivoted at its extreme upper end to the standard S, and provided with the curved slot .9, lateral handle, knife-stock K and knife, all substantially as described.

LEWIS S. HOYT.

Witnesses:

CHARLES F. HoY'r, FRANK J. HOYT. 

